<!DOCTYPE html>
<html lang="zh_CN">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
   
    @media screen and (max-width:539px) {
      body {
        background-color: black;
      }
    }
    @media screen and (min-widht: 540px) {
      body {
        background-color: pink;
      }
    }
    @media screen and (min-width: 800px) {
      body {
        background-color: red;
      }
    }
  </style>
</head>
<body>
  
</body>
</html>